Question

what was the most direct air mail delivery route across the country from new york city to san Francisco

Answer 1

Answer:

The first regularly scheduled airmail route connected New York and Washington, D.C., via

Philadelphia, from May 15, 1918, to May 31, 1921. The Post Office Department operated the

218-mile route to demonstrate that mail transportation by airplane was possible on a regular

schedule in all kinds of weather.